package org.deri.socializer.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1 {
	
	private static String convertToHex(byte[] data) { 
	    StringBuffer buf = new StringBuffer();
	    for (int i = 0; i < data.length; i++) { 
	      int halfbyte = (data[i] >>> 4) & 0x0F;
	      int two_halfs = 0;
	      do { 
	        if ((0 <= halfbyte) && (halfbyte <= 9)) 
	          buf.append((char) ('0' + halfbyte));
	        else 
	          buf.append((char) ('a' + (halfbyte - 10)));
	        halfbyte = data[i] & 0x0F;
	      } while(two_halfs++ < 1);
	    } 
	    return buf.toString();
	  } 

	  public static String hashCode(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException  { 
	    MessageDigest md;
	    md = MessageDigest.getInstance("SHA-1");
	    byte[] sha1hash = new byte[40];
	    md.update(text.getBytes("iso-8859-1"), 0, text.length());
	    sha1hash = md.digest();
	    return convertToHex(sha1hash);
	  } 
	
	
}
